CI, build 5: Extract cacheable part of runtime image #3987
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Signed-off-by: apostasie <spam_blackhole@farcloser.world>
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See #3986 |
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For context, see #3924, and the start of this PR cycle at #3983.
On top of #3986
Currently, we do not cache at all the runtime image.
So, for every supported target, at every run, we download ubuntu:24.04 from docker hub, then a bunch of packages from ubuntu servers.
This PR addresses that by extracting the cacheable part.
We should see a good speed-up on the later build stage, a significant decrease in our communications with Hub and Ubuntu repos, at the cost of a larger cache.
Note that these benefits will NOT be seen until a later PR, as getting this stage into the
dependenciespipeline requires more modifications on other stages,